[PCH] When keeping track of top-level decls for "targeted deserialization"
make sure we don't mistake ParmVarDecls for top-level decls.

Fixes rdar://10920009.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@151330 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed